One Direction fans have outdone themselves this time!

So it's Harry Styles' birthday today and how did dedicated 1D fans show their love for the big-haired, doe-eyed charmer?

They raised over $16,000 for a charity close to Harry's heart. Wow!

Harry is a long-time supporter of The London Lesbian and Gay Switchboard and it looks like the 21-year-old star's fans pulled out all the stops to honour their hero's big day.

Getting the ball rolling on Twitter, the dedicated fans encouraged one another to donate to the voluntary organisation and it certainly paid off.

Donations have been pouring in from all over the world and there's no doubt that fans dug deep for Harry's big day.

The singer has shown his support for gay rights in the past and even recorded a special anniversary message for the London Lesbian and Gay Switchboard on their 40th year in operation.

We can only imagine how overwhelmed Harry must be today!